make sure path has a leading slash...
make sure path has a leading slash...

fixes https://github.com/EventedMind/iron-router/issues/963.

@tmeasday, I agree this needs to be cleaned up. But to get this out the
door let's come back to it. This should work for now. Let me know.

Sombressoul/iron-middleware-stack,aldeed/iron-middleware-stack,iron-meteor/iron-middleware-stack